EP2023643A3 - Video signal processing apparatus performing gamma correction by cubic interpolation computation, and method thereof - Google Patents

Video signal processing apparatus performing gamma correction by cubic interpolation computation, and method thereof Download PDF

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Publication number
EP2023643A3
EP2023643A3 EP08159881A EP08159881A EP2023643A3 EP 2023643 A3 EP2023643 A3 EP 2023643A3 EP 08159881 A EP08159881 A EP 08159881A EP 08159881 A EP08159881 A EP 08159881A EP 2023643 A3 EP2023643 A3 EP 2023643A3
Authority
EP
European Patent Office
Prior art keywords
section
video signal
correction
level
interpolation computation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08159881A
Other languages
German (de)
French (fr)
Other versions
EP2023643A2 (en
Inventor
Fuminori Higashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renesas Electronics Corp
Original Assignee
Renesas Electronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renesas Electronics Corp filed Critical Renesas Electronics Corp
Publication of EP2023643A2 publication Critical patent/EP2023643A2/en
Publication of EP2023643A3 publication Critical patent/EP2023643A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
    • H04N9/69—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits for modifying the colour signals by gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6027—Correction or control of colour gradation or colour contrast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Picture Signal Circuits (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Image Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

A video signal processing apparatus includes a non-equidistant section determination circuit, a sample data register, and an interpolation computation circuit. The non-equidistant section determination circuit detects a non-equidistant section having different intervals between plural sample points set for the dynamic range of a video signal to be inputted. The sample data register holds the signal level (correction level) of a video signal after correction for each sample point. The interpolation computation circuit obtains the signal level of the video signal after correction by executing cubic interpolation computation with reference to the correction level. Here, a first section is defined as a section located on a lower signal level side and having intervals of X (X > 0) between sample points, and a second section is defined as a section located on a higher level side and having intervals of Y (Y > 0, X ≠ Y) between sample points. With respect to the border point between the first and the second sections, the interpolation computation circuit obtains the signal level of the video signal after correction by use of the correction level of a sample point added so that the second section can be formed on the lower level side and/or the first section can be formed on the higher level side.
EP08159881A 2007-07-23 2008-07-08 Video signal processing apparatus performing gamma correction by cubic interpolation computation, and method thereof Withdrawn EP2023643A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007190888A JP4922091B2 (en) 2007-07-23 2007-07-23 Video signal processing device, video signal processing method, and display device

Publications (2)

Publication Number Publication Date
EP2023643A2 EP2023643A2 (en) 2009-02-11
EP2023643A3 true EP2023643A3 (en) 2013-02-13

Family

ID=39938213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08159881A Withdrawn EP2023643A3 (en) 2007-07-23 2008-07-08 Video signal processing apparatus performing gamma correction by cubic interpolation computation, and method thereof

Country Status (5)

Country Link
US (2) US8248493B2 (en)
EP (1) EP2023643A3 (en)
JP (1) JP4922091B2 (en)
KR (1) KR100968095B1 (en)
CN (1) CN101383976B (en)

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JP5241031B2 (en) * 2009-12-08 2013-07-17 ルネサスエレクトロニクス株式会社 Display device, display panel driver, and image data processing device
US20110298972A1 (en) * 2010-06-04 2011-12-08 Stmicroelectronics Asia Pacific Pte. Ltd. System and process for image rescaling using adaptive interpolation kernel with sharpness and de-ringing control
JP2014219724A (en) * 2013-05-01 2014-11-20 キヤノン株式会社 Image processor, method for controlling image processor, and program
CN105139345B (en) * 2015-06-25 2018-07-24 武汉烽火众智数字技术有限责任公司 A kind of automatic search method of high-quality non-standard gamma curve
KR102433924B1 (en) 2016-01-14 2022-08-19 삼성전자주식회사 Display controller and application processor including the same
CN107124602B (en) * 2017-05-24 2018-10-19 四川长虹电器股份有限公司 The automatic gamma curve adjustment method of production line
CN107346653B (en) * 2017-06-28 2021-05-07 武汉精测电子集团股份有限公司 GAMMA curve adjusting method and device based on deep learning
CN109308078B (en) * 2017-07-27 2021-08-27 龙岩智康太阳能科技有限公司 Heliostat control method and device, computer-readable storage medium and terminal equipment
WO2021168808A1 (en) * 2020-02-28 2021-09-02 京东方科技集团股份有限公司 Image processing device and method, display device and computer-readable storage medium
CN115862520A (en) * 2023-01-04 2023-03-28 昇显微电子(苏州)股份有限公司 Gamma correction calculation method for display system
CN116959354B (en) * 2023-06-21 2024-08-16 重庆惠科金渝光电科技有限公司 Driving circuit, circuit driving method and display panel

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US6816155B1 (en) * 1999-03-29 2004-11-09 Fuji Photo Film Co., Ltd. Method of correcting gradation and image display system employing the same
US6690490B1 (en) * 1999-04-16 2004-02-10 Sharp Kabushiki Kaisha Image processor
US6292165B1 (en) * 1999-08-13 2001-09-18 Industrial Technology Research Institute Adaptive piece-wise approximation method for gamma correction
US20030133138A1 (en) * 2001-07-02 2003-07-17 Takeshi Namikata Image processing method and apparatus
JP2004140702A (en) * 2002-10-18 2004-05-13 Sony Corp Image signal processor, gamma correcting method and display
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US20050276502A1 (en) * 2004-06-10 2005-12-15 Clairvoyante, Inc. Increasing gamma accuracy in quantized systems

Also Published As

Publication number Publication date
KR20090010934A (en) 2009-01-30
KR100968095B1 (en) 2010-07-06
US20120274854A1 (en) 2012-11-01
US20090027559A1 (en) 2009-01-29
EP2023643A2 (en) 2009-02-11
US8248493B2 (en) 2012-08-21
CN101383976B (en) 2012-01-11
US9106877B2 (en) 2015-08-11
JP2009027612A (en) 2009-02-05
CN101383976A (en) 2009-03-11
JP4922091B2 (en) 2012-04-25

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